Yes, the story is a big plus in the game.
But don't tell me you are really considering using ESC for jumping? Escape is almost universally acknowledged as the key which "escapes" the normal flow (hence the name) and brings you either back a level (UI level, not game level) or calls a Pause menu. On most (PC) games which include jumping, the "jump button" is SPACE. That's even the Default in some game engines.